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Excretion notes

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excretion

Dr. M. Nedwidek; Stuy HS Linda Luu 12/18/09 SL1-05 (pds 3+4) Aim: How are wastes filtered from blood? Intro: Just as gas exchange provides the raw materials for energy production, excretion gets rid of wastes in the volume of wastes and liquids in one?s body; must be homeostatically maintained or kept constant-at equilibrium. (Blood is at equilibrium.) Mammalian urinary systems remove waste. Vertebrate Urinary/Excretory Systems Function to: Regulate blood levels of ions Regulate H2O content of blood Maintain proper pH of blood Retain glucose and amino acids in blood (nutrients) Secrete hormones (like erythropoietin) Eliminate cellular wastes like urea Urine is a product of urea which results from amino acid metabolism.

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